20495811888 has 160 divisors (see below), whose sum is σ = 62695987200. Its totient is φ = 6395710464.

The previous prime is 20495811887. The next prime is 20495811907. The reversal of 20495811888 is 88811859402.

20495811888 is a `hidden beast` number, since 2 + 0 + 49 + 581 + 18 + 8 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (20495811883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 445048 + ... + 488936.

It is an arithmetic number, because the mean of its divisors is an integer number (391849920).

Almost surely, 2^20495811888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20495811888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31347993600).

20495811888 is an abundant number, since it is smaller than the sum of its proper divisors (42200175312).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20495811888 is a wasteful number, since it uses less digits than its factorization.

20495811888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43976 (or 43964 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 54.

The spelling of 20495811888 in words is "twenty billion, four hundred ninety-five million, eight hundred eleven thousand, eight hundred eighty-eight".